The Free On-line Dictionary of Computing (30 December 2018):

Redundant Array of Independent Disks

    (RAID) A standard naming convention
   for various ways of using multiple disk drives to provide
   redundancy and distributed I/O.

   The original ("..Inexpensive..") term referred to the 3.5 and
   5.25 inch disks used for the first RAID system but no longer
   applies.  As solid state drives are becoming a practical
   repacement for magnetic disks, "RAID" is sometimes expanded as
   "Redundant Array of Independent Drives".

   The following standard RAID specifications exist:

    RAID 0	Non-redundant striped array
    RAID 1	Mirrored arrays
    RAID 2	Parallel array with ECC
    RAID 3	Parallel array with parity
    RAID 4	Striped array with parity
    RAID 5	Striped array with rotating parity

   RAID originated in a project at the computer science
   department of the University of California at Berkeley,
   under the direction of Professor Katz, in conjunction with
   Professor John Ousterhout and Professor David Patterson.
   A prototype disk array file server with a capacity of 40
   GBytes and a sustained bandwidth of 80 MBytes/second was
   interfaced to a 1 Gb/s local area network.  It was planned
   to extend the storage array to include automated optical
   disks and magnetic tapes.


(ftp://wuarchive.wustl.edu/doc/techreports/berkeley.edu/raid/raidPapers).

(http://HTTP.CS.Berkeley.EDU/projects/parallel/research_summaries/14-Computer-Architecture/).

   ["A Case for Redundant Arrays of Inexpensive Disks (RAID)",
   "D. A. Patterson and G. Gibson and R. H. Katz", Proc ACM
   SIGMOD Conf, Chicago, IL, Jun 1988].

   ["Introduction to Redundant Arrays of Inexpensive Disks
   (RAID)", "D. A. Patterson and P. Chen and G. Gibson and
   R. H. Katz", IEEE COMPCON 89, San Francisco, Feb-Mar 1989].

   (2012-08-26)